MESON Chess Problem Database

Problem Display
PID: 90414 (8/8/8/K6B/N5R1/4P3/1R1p2Q1/2Bkq1n1 w - - 0 1)

Ceriani, Luigi

Die Schwalbe, 1930

8/8/8/K6B/N5R1/4P3/1R1p2Q1/2Bkq1n1

#2

8 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc1
      • 2.Rc4#
    • 1...Qg3
      • 2.Qxd2#
    • 1...Qh4
      • 2.Qxd2#
    • 1...Qf1
      • 2.Qxf1#
      • 2.Qxd2#
  • Tries
    • 1.Rxd2+?
      • 1...Qxd2+
        • 2.Qxd2#
      • 1...Kxc1!
  • Keys
    • 1.Qxg1!
      • threat
        • 2.Rc4#
      • 1...dxc1Q+
        • 2.Rgb4#
      • 1...dxc1S+
        • 2.Sc3#
      • 1...dxc1B+
        • 2.Sc3#
        • 2.Rgb4#
      • 1...dxc1R+
        • 2.Rgb4#
      • 1...Kxc1
        • 2.Rc4#
      • 1...Ke2
        • 2.Rd4#
      • 1...Qxg1
        • 2.Rxg1#
      • 1...Qf1
        • 2.Qxf1#

This is a version

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • K(a);P-FLIGHT,S_CUTQ(b),S_CUTS(c),S_CUTS(c),XB(A)::R(F)
    • Q(b);N_GUARD::QAR1(C),XP(d)
  • Tries
    • Try
      • R(B);CHECK,P_SPINR(B),XP(d)
      • Vars
        • Q(b);CHECK,OGATE,XR(B)::QAR1(C),XQ(b)
      • Refutation
        • K(a);P-FLIGHT,XB(A)
  • Actual
    • Q(C);P_PINQ(b),XS(c)
    • Threat
      • B(H)+R(F)
    • Vars
      • P(d);CHECK,SBLOCK,XB(A)::B(H)+R(F)
      • P(d);CHECK,SBLOCK,XB(A)::S(E)
      • K(a);P-FLIGHT,XB(A)::R(F)
      • K(a);N_GUARD,N_SPINQ(b),P_SPINP(d),S_FLIGHT::B(H)+R(F)
      • Q(b);N_SPINQ(b),OGATE,XQ(C)::B(H)+R(F),DCHECK,XQ(b)
      • Q(b);OGATEB::QAR2(C),XQ(b)
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